“If one has cooperated extensively with an individual in the past, that’s a sign of more to come. Thus, cooperation may be efficiently automated by a psychological program that makes one care about one’s historical cooperation partners. Such a program might be called friendship.”

“If one has cooperated extensively with an individual in the past, that’s a sign of more to come. Thus, cooperation may be efficiently automated by a psychological program that makes one care about one’s historical cooperation partners. Such a program might be called friendship.”

— Joshua Greene